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dma-direct: make dma_direct_{alloc,free} available to other implementations 

So that they don't need to indirect through the operation vector.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
hifive-unleashed-5.1
Christoph Hellwig 2017-12-23 13:46:06 +01:00
parent 95f183916d
commit 19dca8c0ef
3 changed files with 11 additions and 9 deletions
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9
arch/arm/mm/dma-mapping-nommu.c
View File

@ -11,7 +11,7 @@
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include <linux/dma-direct.h>
#include <linux/scatterlist.h>
#include <asm/cachetype.h>
@ -39,7 +39,6 @@ static void *arm_nommu_dma_alloc(struct device *dev, size_t size,
unsigned long attrs)
{
const struct dma_map_ops *ops = &dma_direct_ops;
void *ret;
/*
@ -48,7 +47,7 @@ static void *arm_nommu_dma_alloc(struct device *dev, size_t size,
*/
if (attrs & DMA_ATTR_NON_CONSISTENT)
return ops->alloc(dev, size, dma_handle, gfp, attrs);
return dma_direct_alloc(dev, size, dma_handle, gfp, attrs);
ret = dma_alloc_from_global_coherent(size, dma_handle);
@ -70,10 +69,8 @@ static void arm_nommu_dma_free(struct device *dev, size_t size,
void *cpu_addr, dma_addr_t dma_addr,
unsigned long attrs)
{
const struct dma_map_ops *ops = &dma_direct_ops;
if (attrs & DMA_ATTR_NON_CONSISTENT) {
ops->free(dev, size, cpu_addr, dma_addr, attrs);
dma_direct_free(dev, size, cpu_addr, dma_addr, attrs);
} else {
int ret = dma_release_from_global_coherent(get_order(size),
cpu_addr);

5
include/linux/dma-direct.h
View File

@ -38,4 +38,9 @@ static inline void dma_mark_clean(void *addr, size_t size)
}
#endif /* CONFIG_ARCH_HAS_DMA_MARK_CLEAN */
void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs);
void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_addr, unsigned long attrs);
#endif /* _LINUX_DMA_DIRECT_H */

6
lib/dma-direct.c
View File

@ -40,8 +40,8 @@ static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)
return phys_to_dma(dev, phys) + size - 1 <= dev->coherent_dma_mask;
}
static void *dma_direct_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs)
{
unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
int page_order = get_order(size);
@ -84,7 +84,7 @@ again:
return page_address(page);
}
static void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_addr, unsigned long attrs)
{
unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;